Was he a random, a member of this site or TA? If he's on TA, I'd like to know so I can avoid him for any future boosting sessions I create.

You could always just do the glitch, which I advised a handful of people to do in the last hour. That is the only way you will get these achievements and according to many, it's in the rules of the game and allowed to do it.

You should of messaged me on Xbox LIVE. I would of popped the game in and helped you with a few matches.